Jagged Points On Mesh

Hi forum.

I’m trying to duplicate the lower part of my mesh to the other side of the model. So I select it, and mirror it to face the correct way, I join the vertices on the model. Seems nothing is odd, but once I add the modifier, I get 2 jagged vertices appearing. I cannot figure where they’re coming from.

Thank you.

the flip operation also flips the normals, so select all and press shift N

Cant believe I didn’t think that the normals would cause an issue. but worked like a gem!

Thanks heaps!